Give me some ideas on how to make my old iphone like new again?

I just had my iPhone 3GS unlocked and I'm using a prepaid sim. I want to keep this phone for awhile so I was wondering how can I make it really nice. I was planning on putting a new housing case on it but I don't know where to get one from. Do you know where to purchase a housing case for the 3GS? Also what other ideas do you have to make the phone really nice?

I like your idea about getting a new housing case for it. Try something durable like the Lifeproof case, something stylish like the VANS Waffle sole case, or something both durable and utility-based like the Mophie Juice Pack Plus.

Here's a good webstore that sells all three (Vans $8, Mophie $40, Lifeproof $40) http://www.bonanza.com/booths/Veo